Big Engines with custom exhaust vibrate ???

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RCjesse - 21 Feb 2007 04:16 GMT

I'm about to buy a 96 firebird 5.7 LT-1. I test drove it today, but it felt
kind of rough when in idle, but as soon as I steped on the gas, that thing
would spin tires. Is this a normal vibration with big motors? The oil
pressure would be at a quarter when idling, then half way or a little more
when cruising at normal speeds. Engine seemed normal, no smoke or noises.
Thanks for any comments since I have never ever driven big sport muscle cars
before. Thanks.

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ATP* - 23 Feb 2007 22:48 GMT

> I'm about to buy a 96 firebird 5.7 LT-1. I test drove it today, but it
> felt
[quoted text clipped - 5 lines]
> cars
> before. Thanks.

An LT-1 is a small block, so it's really not that big. It shouldn't have a
rough idle. It's probably misfiring at idle, which may require an expensive
fix. The oil pressure variation is the same as I've seen on my '95 since it
was new. Kind of scary, I don't know if they were designed that way. The oil
pressure on my 99 Suburban doesn't do that.

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John 'Shaggy' Kolesar - 26 Feb 2007 19:33 GMT

>> I'm about to buy a 96 firebird 5.7 LT-1. I test drove it today, but it
>> felt
[quoted text clipped - 11 lines]
> was new. Kind of scary, I don't know if they were designed that way. The oil
> pressure on my 99 Suburban doesn't do that.

I think Chevy says the oil pressure is supposed to be around 10 PSI for every
1000 RPM. It does look pretty low at idle, but that's normal for the LT1.
FWIW my car has a '94 LT1 in it, but I believe it's the same principle for all
of them.

John.

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